ZURITA Alfredo Eduardo
congresos y reuniones científicas
The most complete known Neogene Glyptodontidae (Mammalia, Xenarthra) from northern South America.: taxonomic and phylogenetic implications
ZURITA, A. E; GONZALEZ-RUIZ, L.; GÓMEZ-CRUZ; ARENAS MOSQUERAS, J.E.
Jornada; XXVI Jornadas Argentinas de Paleontología de Vertebrados; 2012
The knowledge of northern South American Glyptodontidae Gray (Mammalia, Xenarthra, Cingulata) is very scarce compared with that of southern South American taxa, which are systematically studied since XIX century. Recently, the Miocene northern taxa (originally belonging to the Glyptodontidae Propalaehoplophorinae Asterostemma Ameghino and Propalaehoplophorus Ameghino) have been reinterpreted as basal Glyptodontinae, and assigned to the new genus Boreostemma Carlini et al. In this contribution we present and describe the most complete Neogene Glyptodontidae from northern South America (Middle Miocene of the Honda Group, La Venta, Colombia), remarking its main taxonomic, paleobiogeographic and phylogenetic implications. The material is represented by a complete specimen (CAL-896) in an exceptional state of preservation. This new material completes the morphological characterization of B. acostae and corroborates the noticeable differences compared with Miocene southern South American Glyptodontidae. A cladistic analysis was carried out, suggesting that the Glyptodontinae constitutes a monophyletic group, being B. acostae Villarroel and B. venezolensis Simpson the sister group of the remaining taxa of Glyptodontinae, in which the traditionally recognized genera (e.g. Glyptodon Owen and Glyptotherium Osborn) emerge as natural groups. Finally, whereas the Miocene seems to represent a diversification period for Glyptodontidae in Southern South America, the recorded taxa in northern South America are restricted with certainty to the Glyptodontinae Boreostemma